split close and delete icon, add red hover for delete

core/img/actions/close.svg

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core/img/actions/delete-hover.svg

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+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
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+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
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+   height="16"
+   id="svg3875"
+   version="1.1"
+   inkscape:version="0.48.3.1 r9886"
+   sodipodi:docname="delete.svg"
+   inkscape:export-filename="delete-hover.png"
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